Pole type circuit breaker



2 Sheets-Sheet l A. C. SCHWAGER POLE TYPE CIRCUIT BREAKER Filed May 19,1941 IN1/E T012. W be.

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Feb. 23, 1943.

Feb. 23, 1943. A C, SCHWAGER I' 2,311,699

POLE 'TYPE CIRCUIT BREAKER Filed May 19, 1941 2 sheets-sheet 2 151154*Fys-5f i INg NTORW rroswey.

Patented Feb. 23, 1943 POLE TYPE CIRCUIT BREAKER August C. Schwager,Millbrae, Calif., assignor to Pacific Electric San Francisco, forniaManufacturing Corporation, Calif., a corporation of Cali- ApplicationMay 19, 1941, Serial No. 394,082

11 Claims.

My present invention relates to oil circuit breakers, and moreparticularly to a single pole overload responsive circuit breaker forfeeder lines that can be mounted in an elevated position upon a pole orcross arm as a substitute for the high capacity expulsion fuses nowcommonly used for that type of service.

It is an object of the present invention to provide an efficient andinexpensive overload responsive circuit breaker that can be convenientlymounted in an elevated position upon a pole or tower to control a highvoltage electric circuit in a safe and convenient manner.

Another object of the invention is to provide a new and novelarrangement in which the circuit controlling contacts and the lineterminals of a circuit breaker are supported and insulated from eachother and from an operating mechanism with a single insulator.

Another object of the invention is to provide a new and novel insulatingmeans for the circuit controlling elements of a circuit breaker in whichthe operating mechanism, operating at ground potential, and the lineterminals of the circuit breaker are insulated from each other with asingle oil filled porcelain insulator.

A further object of the invention is to provide a new and novel type ofcircuit breaker in which the live circuit controlling parts thereof areinsulated from an operating mechanism at ground potential by means of asingle porcelain bushing and in such a manner that the bushing will notbe subjected to radial electrical stresses.

Another object of the invention is to provide a new and novelarrangement wherein a single oil filled bushing type insulator isadapted to completely enclose and insulate the live circuit controllingelements of the circuit breaker and also carry suitable terminals towhich the conductors of a power line may be connected.

Another object of the invention is to provide a simple and effectiveoperating mechanism and overload trip means for a single pole circuitbreaker in which the live contacts of the circuit breaker and theoverload responsive trip coil are submerged in an insulating iiuid andinsulated from the operating mechanism by a single bushing typeinsulator.

In the manufacture of oil circuit breakers of a type suitable for theservice contemplated by the present invention, it is now generally thepractice to enclose the circuit controlling contacts of the circuitbreaker in a metallic tank that is secured to the under side of asuitable supporting housing which encloses the circuit breaker operatingmechanism. With this type of circuit breaker, the power line connectionsare brought in through two spaced insulating bushings, generally ofporcelain, which are mounted upon and extend through the top of thesupporting housing. Under these conditions the insulating bushings aresubjected to a considerable electrical stress at the point where theypass through the metallic wall of their supporting structure, andbecause of this electrical stress, which is in a radial direction, it isnecessary that the porcelain of the bushings be of the highest quality.Therefore, in addition to the necessity for two bushing type insulators,these prior art circuit breakers also require the use of insulatorswhich are quite expensive. It is known that the most frequent breakdownin insulators of this character occurs at the point where they aresubjected to the above radially applied electrical stress. Whereas,these insulating bushings, even when of a poor quality, will stand manytimes the same electrical stress when applied axially as a creepagestress. It is, therefore, a further object of the invention to provide anew and novel circuit breaker construction in which the line terminalsare insulated from each other and from the operating mechanism and itsenclosing housing in a new and novel manner by a single bushing typeinsulator and in which the insulating bushing is not subjected to aradially applied electrical stress.

Other objects and advantages of the invention will be in part evident tothose skilled in the art and in part pointed out hereinafter inconnection with the accompanying drawings, wherein there is shown by wayof illustration and not of limitation preferred embodiments thereof.

In the drawings;

Figure 1 is an external side view showing a circuit breaker constructedin accordance with the present invention as mounted upon the cross armof a power line supporting pole,

Figure 2 is a view similar to Figure 1 showing i a modied form of theinvention,

Figure 3 is a vertical sectional view taken longitudinally through acircuit breaker constructed in accordance with a preferred embodiment ofthe invention and with the operating mechanism in its closed circuitposition,

Figure 4 is a fragmentary view showing the operating mechanism in itsopen circuit position,

Figure 5 is a fragmentary plan view showing the operating mechanism ofthe circuit breaker,

Figure 6 is a fragmentary plan view of the trip lever taken along lineVI-VI of Figure 3,

Figure 7 is a fragmentary side view taken along line VII- VII of Figure3 looking in direction of arrows,

Figure 8 is a fragmentary plan view showing the upper circuit breakercontact, and

Figure 9 is a fragmentary view showing a manual latch trippingarrangement.

For the purpose of describing my invention, I have illustrated in thedrawings a modification thereof that is particularly adapted for use inan A elevated position, as upon a pole or transmission line tower, whereit may be used instead of dropout fuses and other fusible cutouts, suchas are now generally used to protect against short circuits andoverloads. This device has the advantage over fusible cutouts in that,upon an overload or short circuit, it will interrupt the circuit withoutthrowing any sparks or dropping fused parts to the ground below, andfurther, it will be possible to again restore the circuit by a simplereclosing thereof without the replacement of vany parts, such, forexample, as the fusible link provided with fusible cutouts.

' As shown in Figure 1 of the drawings, the device comprises a metallicsupporting housing Iii that is adapted to be secured upon a cross arm II or other suitable support by means of a clamping bracket i2. Thehousing IB, as will hereinafter appear, carries an operating mechanism,and disposed over this operating mechanism, there is a cover I3.Depending downwardly from the housing Il! there is an oil containingreceptacle il! of insulating material in which cooperating circuitinterrupting contacts are disposed. Ihisoil containing receptacle I4 ispreferably in the form of a cylindrical porcelain bushing and at itsside it is provided with an outwardly extending terminal stud I to whichone lead of the power line is connected. At its bottom, the receptaclele carries a second terminal stud IS to which the other lead of thepower line is connected. In this gure of the drawings it will be notedthat the metallic housing I@ is provided with a sight opening I1 throughwhich an oil l level indicator may be viewed, and at its side thehousing I@ valso supports an exposed operating lever I8 by means ofwhich the operating mechanismwithin the housing IEB may be actuated.This operating lever i8 is provided with an enlarged ring-like end I9into which a hook at the end of a conventional switch operating pole maybe inserted.

In Figure 2 of the drawings there is shown a modication of the inventionin which the oil containing receptacle It, in the form of a porcelainbushing, is shown as closed at its bottom end and as having the terminalstuds l5 and AIt mounted intermediate its ends and in diametricallyopposed relation to each other. this modification of the invention,except for the changes that will be required due to the relocation ofthe terminal stud I6, the construction will be substantially identicalwith that to be hereinafter described.

Reference is now made to Figure 3 of the drawings for a more detaileddescription of the invention. In this figure of the drawings it will benoted that the metallic housing lil is of a basin-like configuration andis open at its bottom. Supported by the housing lil and dependingdownwardly therefrom, there are two insulating supports 2li which may bein the formV of rods or tubes of fibre or like material. Upon the lowerend of the supports 2@ there is mounted a lowerstationary contact 2l,and intermediate In.l

their ends there is secured a supporting frame 22 that carries a secondor upper stationary contact 23. rThe supporting frame 22 is here shownas having outwardly extending flanges between which an overload tripcoil 2li is mounted and they provide a magnetic frame in which avertically movable armature 25 is adapted to move. The lower stationarycontact 2l is shown as enclosed in an arc extinguishing chamber 2% ofconventional design. Extending outwardly from the bottom of the arcextinguishing chamber 26 and in connection with the stationary contact2l, there is a bowed flexible circuit completing member 2! that isadapted to engage with an enlarged head 2S formed upon the inner end ofthe terminal stud It. Likewise, the supporting frame 22 also carries anoutwardly extending bowed flexible circuit completing member 2 that is Yadapted to engage an enlarged head e@ upon the terminal stud l5. Thefixed end of the circuit completing member 29 is connected to oneterminal of the overload trip coil 2li and the other terminal of thetrip coil 2li is connected to the supporting frame 22 which is incontact with and carries the upper stationary contact Z3. Cooperatingwith the stationary contacts 2i and 23 there is a vertically movablebridging member 3l that is adapted to complete a circuit therebetween.In this way, when the bridging member SI is in the position shown, acircuit will be completed from the terminal stud l5 via the circuitcompleting member 2S, through the trip coil 24 to the stationary uppercontact 23, then through the vertically movable bridging member SI tothe lower stationary contact 2l and out through the circuit completingmember 2l to the other terminal stud Iii. From this it will be seen thatall of the live parts of the circuit breaker will be immersed in the oilor other insulating fluid, designated by the numeral 32, carried by theoil containing receptacle lil and also insulatedvfrom the operatingmechanism within the housing It. The bridging member Si is here shown assecured to the lower end of a downwardly extending operating rod or tube33 which may be of bre or other insulating material. The operating rod33 is shown as connected at its upper end to a split lever 3d that ispivotally secured upon a iioating fulcrum 35 wln'ch is carried by atransversely extending shaft 35. The split lever 5d is shown as oifsetat its free end where it connects with the operating rod 33 andintermediate its ends it is connected to a bell crank lever Si by meansof which it is moved to produce a substantially straight line movementof the operating rod 33. The bell crank lever Si is pivotally mountedupon a transversely extending shaft 33 and it has a downwar ly extendingarm 3d. Connected between the downwardly extending arm SS of the bellcrank lever 3l and a lever it which is secured to the shaft 3S, there isa pair of cooperating toggle links 4I and #i2 that are adapted to beheld in fixed and operative relation with each other by means of a latchi3 that is pivotally mounted upon the downwardly extending arm 35.Mounted adjacent the transversely extending shaft 38, the housing lilcarries two bowed springs Il and d5 that are adapted to operate upon thebell crank lever 3l and move it in a clockwise direction when theconnection formed by the toggle links Si and l2 is collapsed by anoperation of the latch 53. The latch @3 has a downwardly and inwardlydisposed end 'it with which a tripping lever l is adapted to engage, andas here shown, the tripping lever il is biased into an inoperativeposition by a coiled spring 48. The armature 25 of the overload tripcoil 24 is also shown as connected to the tripping lever 41 by means ofan insulating rod or tube 49. With the toggle forming links 4| and 42arranged and secured in the position here shown, it will be seen thatwhen the latch 43 is rotated clocl wise by an actuation of the trippinglever 41, it will release the end of the link 4|, with which itcooperates, and permit the toggle formed by the links 4| and 42 tocollapse. This will permit the springs 44 and 45 to rotate the bellcrank lever 31 upwardly and cause the split lever 34 to rotate about itsfloating fulcrum 35 in a counter-clockwise direction and thus, throughthe operating rod 33, carry the Contact bridging member 3| out ofcontact making engagement with the lower stationary Contact 2| and clearof the arc extinguishing housing 26 to thus open the circuit between theterminal studs and I6 of the circuit breaker.

By referring now to Figure 4 oi the drawings, it will be seen that whenthis collapse of the toggle formed by the links 4| and 42 occurs, thelever 40 carried by the shaft 35 will not move, but will remain in theposition illustrated in Figure 3. Now, if it is desired to again closethe circuit breaker by moving the bridging member 3| downwardly and intocircuit making engagement with the lower stationary contact 2|, this canbe done by operating the lever IS, previously referred to in connectionwith Figure 1 of the drawings, upwardly. This will rotate the shaft 33and thus carry the lever 43 into its upper position, indicated by dotand dash lines, where the toggle formed by the links 4| and 42 will beagain locked in an extended and cooperating relation with each other bymeans of the latch 43, as will be clearly understood. rIhen, by adownward movement of the lever i3 by means of an operating pole, aspreviously described, the lever 40 can be again moved downwardly andthrough the extended toggle forming links 4| and 42, cause the bellcrank lever 31 to rotate in a counterclockwise direction against theaction of the springs 44 and 45 to again carry the lever 34 in adownward direction to thus cause the operating rod 33 to move thebridging member 3| into circuit forming engagement with the lowerstationary contact 2|. Should it now happen that the abnormal conditionis still in existence upon the power line at the time of such areclosing of the circuit breaker, it will be readily seen that theoverload trip coil 24 will again operate upon its armature 25 as soon asthe circuit is reestablished and, as a result, the tripping lever 41will operate upon the latch 43 and thus again collapse the toggle formedby the links 4| and 42 and permit the bell crank lever 31, under theinfluence of the springs 44 and 45, to move the split lever 34 upwardlyand thus again open the circuit in a trip free manner with respect tothe operating levers |8 and 4|] that are secured upon the shaft 36.

Upon referring to Figure 5 of the drawings, it will be seen that thedownwardly extending insulating supports 20 are secured in parallelspaced relation upon anges 50 that extend into the opening formed in thebottom of the metallic housing Il). These flanges 50 carry upstandingcylindrical bosses in which the upper ends oi the supporting rods ortubes 20 are secured, either by a pin or by threading. As here shown, itwill also be noted that the split lever 34 and the bell crank lever 31arev mounted upon their respective 75 shafts '36 and 38 so that theywill operate in the central plane of the housing l0, and that the toggleoperating lever 4U and the toggle links 4| and 42 are located to operatein a plane at one side of the levers 34 and 31. It will also be notedthat the shaft 3B is extended outwardly from the housing |0 through asupporting boss 5| so that the operating lever I8 may be convenieintlyengaged by an operating pole.

In Figure 6 of the drawings the tripping lever 41 is shown as of aspecial construction that will permit its operation without interferencewith the free upward and dovmward movement of the operating rod 33 whichcontrols the movement of the bridging member 3i. The tripping level 41is also here illustrated as pivotally mounted upon a bracket 52 that issecured to the bottom of the housing I0.

Reference is now made to Figures "I and 8 of the drawings for adescription of the manner in which the upper contact 23 and the tripcoil 24 are mounted upon the downwardly extending insulating supports20. As here shown, the supporting frame 22 has outwardly extendingportions 52' formed upon its upper and lower flanges through which thevertically disposed insulating supports 20 extend, and located betweenthese flanges, the supporting frame 22 is also provided with twooutwardly extending oppositely disposed ears 53 that are adapted to besecured to the insulating supports 20 to thus hold the supporting frame22 in a xed position. At this point it will also be noted that theflexible circuit completing member 29 is cut out or forked at itssecured end to provide a clearance through which the operating rod 33that carries the bridging member 3| may move. Below the outwardlyextending ears 53 the supporting frame 22 also carries two oppositelyextending and outwardly disposed supporting arms 54 between which, as ismore clearly shown like members 55, that form the lower contact 23, aremounted. These spring-like members 55 may be of bronze or otherresilient conducting metal and they are preferably shaped at theircenters so as to provide a good contact and also permit a free slidingmovement of the bridging member 3| therebetween.

In Figure 9 of the drawings I have illustrated a means by which thecircuit controlling contacts described above may be actuated manually,as where it may be desired to open the circuit breaker under normaloperating conditions. For this purpose I provide a normally inactivelatch 56 which is pivoted upon a iixed supporting shaft 51 that iscarried by the housing I0. As here shown, the latch 56 has a downwardlydepending end 58 that engages an abutment 59 which serves to hold thelatch 56 in a position where it will cooperate with the upwardlyextending end of the latch 43. With this arrangement, assuming thecircuit breaker contacts are closed and that the operating lever 40 andthe toggle forming links 4| and 42 are in their extended position, asshown in Figure 3 of the drawings, it will be seen that upon an upwardoperation of the lever 8 the links 4| and 42 and the latch 43 will bemoved to the left and thus the upper extending end of the latch 43 willbe brought into engagement with one of a series of overhanging teeth 60upon the latch 56. When this occurs, the latch 43 will be held againstfurther movement to the left and consequently it will rotate upon itssupporting shaft relative to the link 42 and thus disengage the latchedin Figure 8, two spring-v cooperating end of the toggle forming link 4l.This will permit the toggle formed by the links 4l and 42 `tovimmediately collapse and the springs 44 and 45 will then be free tooperate the circuit breaker with a quick opening action independently ofthe operating levers I8 and 4D. The importance of this additionalfeature is that it prevents a slow circuit opening movement of thebridging member 3|, such as might occur if the entire opening of thecircuit breaker were controlied by an operating pole, and thus avoids aburning of the contacts and the generation of high explosive pressureswithin the arc extinguishing chamber 25.

While I have, for the sake of clearness and in order to disclose theinvention so that the same can be readily understood, described andillustrated specic devices and arrangements, I desire to have itunderstood that this invention is not limited to the specific meansdisclosed, but may be embodied in other ways that will suggestthemselves to persons skilled in the art. It is believed that thisinvention is new and all such changes as come within the scope of theappended claims are to be considered as part of this invention.

Having thus described my invention, what I claim and desire to secure byLetters Patent is:

l. In a pole type circuit breaker, the combination of an enclosinghousing adapted to be secured upon an elevated structure, an insulatingsupport extending downwardly from said housing, a spaced contactsmounted upon insulating support, a bridging member movable with respectto said contacts to establish and interrupt a circuit therebetween,means carried by said housing for operating said bridging member, acontainer of insulating material secured to said housing and enclosingsaid spaced contacts and said bridging member, a pair oi line terminalsmounted in spaced relation in the wall of said container and having anexposed Contact surface at their inner ends, and cooperating connectorforming means extending outwardly from eachof said spaced contactsengageable with the exposed contact surface of an adjacent lineterminal, whereby a circuit including said contacts and said bridgingmember will be established between said line terminals when said`insulating container is secured in position upon said enclosing housing.

2. In a pole type circuit breaker, the combination an enclosing housingadapted to be secured upon 'an elevated structure, an insulatingsupportJ extending downwardly from said houspair or spaced contactsmounted upon said og support, a bridgingV member movable wit respect tosaid contacts to establish and interrupt a circuit therebetween, meanscarried by said housing for operating said bridging member, a hollowporcelain insulator suspended from said housing and enclosing saidspaced contacts and id bridging member, said porcelain insulator open atthe top and closed at the bottom and adapted to carry an insulating oilin which said contacts and said bridging mein-ber are immersed, a pairof line terminals mounted n'spaccd relation in the wall ofsaid insulatorhaving an exposed contact surface at inner ends, and cooperatingconnector for ng means extending outwardly from each of Ysaid spacedcontacts and engageable with the exposed contact surface of an adjacentline termina), whereby a vcircuit including said contacts and saidbridging member will be established between said line terminals whensaid insulator is secured in position upon said enclosing housing.

3. In a pole type circuit breaker, the combination of a pair ofstationary contacts mounted in spaced insulated relation to each other,a bridging member for establishing a circuit between said contacts, areceptacle of insulating material surrounding said stationary contactsand said bridging member and containing oil in which said contacts andsaid bridging member are immersed, a pair of spaced line terminalsextending through the wall of said receptacle at spaced points havingenlarged contact forming heads exposed within said receptacle, andcurrent conducting members extending from said stationary contactsadapted to engage the contact forming heads oi said spaced lineterminais, whereby a circuit will be withheld between said stationarycontacts and said spaced line terminals when said receptacle ispositioned to enclose said stationary contacts.

1i. in a pele type circuit breaker, the combination oi a metallichousing adapted to be secured upon an elevated structure, a downwardlyextending support oi insulating material carried by said housing, a pairof spaced stationary contacts mounted upon said insulating support, abridging member movable with respect to said spaced1 sta' 'onarycontacts for opening and ciosing a cir.. clot between said contacts, anoperating mechanism ior moving said bridging member carried by saidmetallic housing and having insulated operating connection with saidbridging member, a receptacle of insulating mate 1iai adapted tostationary contacts and bridgr and carry an arc extinguishing fluid idcontacts are immersed, and a pair of line t Ainal forming membersextending through the wall or said receptacle at spaced points and eacha connection with an adjacent stationary contact, whe eby said lineterminals will be insulated from each other and fr; n said metallichousing by said receptacle of suiating material.

5. In a pcie type circuit breaker, the combination a rn tallic housingadapted to be secured upon an elevated structure, a downwardly extending`support of insulating material carried by said housing, a pair oi'axially spaced stationary contacts mounted upon said insulating supportone above the other, a vertically movable bridging member forestablishing a crcuit between said contacts, an operating mechanismcarried by said metallic housing having an insulated operatingconnection for moving said bridging member, a single hollow insulatoradapted to enclose said stationary contacts and said bridging meniberand carry an arc extinguishing fluid in which said contacts areimmersed, and a pair of line terr Enal forming members extending throughthe wall of said insulator at spaced points and having connections withsaid stationary contacts, whereby said line terminal forming memberswill be from each other and from said housing operating mechanism bysaid single hollow insulator.

l In a pole type circuit breaker, the combination or a metallic housingadapted to be secured upon a pole or cross arm, an operating mechanisrnmounted within said metallic housing, a downwardly extending insulatingsupport having a stationary contact intermediate its ends and a secondstationary contact at its extreme lower end, an overload trip coilmounted upon said insulating support adjacent said rst contact andhaving one of its terminals connected thereto, a exible outwardlyextending current conducting member xed upon said insulating support towhich the other end of said overload trip coil is connected, a secondexible current conducting member connected to and extending outwardlyfrom said second contact, a contact bridging member controlled by theoperating mechanism mounted within said metallic housing forestablishing a circuit between said contacts, an enclosing receptacle ofinsulating material secured at its upper end to said metallic housingand in which said insulating support and Said stationary contacts aredisposed, and line terminals mounted in spaced relation upon andextending through the wall of said enclosing receptacle and engageablewith a corresponding one of said iiexible outwardly extending currentconducting members, whereby a circuit including said stationary contactssaid contact bridging member and said overload trip coil will beestablished between said line terminals when said enclosing receptacleis secured in position upon said metallic housing.

7. In a pole type circuit breaker, the combination of a metallic housingadapted to be secured upon a pole or cross arm, an operating mechanismmounted within said metallic housing, a downwardly extending insulatingsupport having a stationary contact intermediate its ends and a secondstationary contact at its extreme lower end, an overload trip coilmounted upon said insulating support adjacent one of said contacts andhaving one of its terminals connected thereto, a ilexible outwardlyextending current conducting member iixed upon said insulating sup'-port to which the other end of said overload trip coil is connected, asecond flexible current conducting member connected to and extendingoutwardly from the other of said contacts, a contact bridging membercontrolled by the operating mechanism mounted within said metallichousing for establishing a circuit between said contacts, asubstantially cylindrical insulator ha ing its upper end open andsecured to said metallic housing into which said insulating support andsaid stationary contacts are disposed, the lower end of said insulatorbeing closed, an insulating iiuid carried to said insulator into whichsaid stationary contacts said trip coil and said bridging member areimmersed, and line terminals mounted in spaced relation upon andextending through the wall of said enclosing receptacle and engageablewith a corresponding one of said flexible outwardly extending currentconducting members, whereby a circuit which will include said stationarycontacts said contact bridging member and Said overload trip coil willbe established below the surface of said insulating iiuid and betweensaid line terminals when said enclosing receptacle is secured inposition upon said metallic housing.

8. In a pole type circuit breaker, the combination of a metallic housingenclosing an operating mechanism and supporting a pair of cooperatingcircuit controlling contacts in insulated relation therebelow, aninsulating receptacle of porcelain adapted to contain an insulatingfluid and be suspended from Said metallic housing and surround saidcooperating contacts, a line terminal extending through the side of saidinsulating receptacle intermediate its ends, a second line terminalmounted in and extending through the bottom of said insulatingreceptacle, and means forming a connection between said line terminalsand a corresponding one of said circuit controlling contacts, wherebysaid line terminals will be insulated from each other and from saidmetallic housing by said insulating receptacle.

In a totally enclosed oil immersed circuit breaker, the combination of ametallic housing adapted to enclose an operating mechanism, saidmetallic housing having an open bottom through which insulated contactoperating members extend, a support of insulating material carriedv bysaid metallic housing also extending downwardly through the bottomthereof, cooperating circuit controlling contacts mounted in spacedrelation upon said support of insulating material and adapted to beoperated to open and close a circuit by the operating mechanism in saidmetallic housing, an overload trip coil mounted upon said insulatingsupport adjacent `one of said contacts and connected at one end thereto,a substantially cylindrical closed bottom insulator of ceramic materialhaving terminals mounted thereupon in spaced relation at pointscorresponding to the location of said cooperating contacts, means forsecuring said insulator with its open end in register with the openbottom of said metallic housing, and means for connecting saidcooperating contacts with said terminals when said insulator is securedupon said metallic housing, whereby the entire circuit breaker mechanismwill be completely enclosed.

10. In an overload responsive circuit breaker of the characterdescribed, the combination of a metallic housing having an open bottomand adapted to be mounted in an elevated position, a support ofinsulating material carried by and extending downwardly through thebottom of said metallic housing, a stationary contact mounted upon thelower end of said support, a second stationary contact secured upon saidsupport in spaced relation above said first contact, a verticallymovable current conducting member adapted to establish a connectionbetween said stationary contacts, a manually controlled lever mechanismwithin said housing having an insulated connection with said verticallymovable current conducting member for moving it into circuitestablishing relation With said stationary contacts, spring meansadapted to operate said lever mechanism in a reverse direction to movesaid current conducting inember out of circuit establishing relationwith said stationary contacts, a trippable latch for holding said levermechanism against the action of said spring means, an overload trip coilmounted upon said insulating support having one terminal connected tothe upper one of said stationary contacts, an insulated mechanicalconnection between said overload trip coil and said trippable latch, asubstantially cylindrical porcelain insulator having an open upper endand a closed bottom adapted to contain an insulating fluid, means forsecuring said insulator with its open end in register with the openbottom of said metallic housing, a pair of line terminals mounted inspaced relation upon said insulator, an outwardly extending conductorconnected to the other terminal of said trip coil and engageable withone of said line terminals, a second outwardly extending conductorcarried by said irst stationary contact adapted to engage the other oneof said line terminals, whereby said stationary contacts said currentconducting member and said overload trip coil will be operativelyimmersed in said insulating fluid when said insulator is secured uponsaid metallic housing.

11. 'In an overload responsive circuit breaker of the characterdescribed, the .combination of a metallic support, adapted :to `bemounted in an elevated position, a centrally disposed downwardlyextending support of insulating material, a stationary contact securedat the lower `end of said support, a second stationary contact securedupon said support in spaced and aligned relation with said rst contact,a vertically movable current conducting member adapted to establish aconnection between said stationary contacts, a manually controlled levermechanism 4having an insulated connection with said vertically movablecurrent conducting member for .moving it into circuit establishingrelation between said stationary contacts, lspring means .adapted tooperate said lever mechanism in a reverse direction to move saidcurrentl conducting member out of circuit making engagement between saidstationary contacts, a trippable latch for holding said lever mechanismagainst the action of said spring means, an overload trip coil mountedupon said insulating support and having one terminal connected to theupper one of said stationary contacts, an insulated mechanicalconnection between said overload trip coil for operating said trippablelatch, a substanducting member and said overload trip coil are immersed,said insulator having a terminal contact mounted in the side thereofadjacent the upper one of said stationary contacts, a second terminalContact extending through the closed end of said insulator adjacent therst of said stationary contacts, an outwardly extending exibleconducting member carried by said insulating support and connected tothe other terminal of said overload trip coil and adapted to establish aconnection with said first terminal contact when said insulator issecured upon said support, a second outwardly extending flexibleconducting member connected to said rst stationary contact and engagingsaid second ter- .minal contact, and means for securing said insulatorin `suspended relation upon said support, whereby said stationarycontact said current conducting member and said overload trip coil willbe operatively immersed in said insulating fluid and insulated from saidmetallic support by said insulator.

AUGUST C. SCHWAGER.

CERTIFICATE OF CORRECTION. Patent No. 2,511,699. February 25, l9l5AUGUST C. SCHWAGER.

It is hereby certi fied that error appears in the printed specificationof' the above numbered patent requiring correction as follows: Page b.,seoond column, line 19, claim 5, for the word "withheld" readestabl1shed;

and that the said Letters -Patent shouldbe reaciwith this correctiontherein that the same may conform to the record of the oase in thePatent Office.

Signed and sealed this 20th day of July, A. D.' l9h5.

Henry Van Arsdale, (Seal) Acting Commissioner of Patents.

CERTIFICATE or CORRECTION. Patent No. 2, 511,699. February 25, 19kg.

AUGUST C. scHwAGER.

' It is hereby Certified that error appears in the printed specificationof the above numbered patent requiring correction as follows: Page L,second column, line 19, claim, for the word "withheld" read--established;

and that the said Letters .Patent shouldbe read'wth this correctiontherein that the same may conform to the record of the case in thePatent Office.

signed and sealed this zoen day of July, A. D. 19115. Y

Henry Van Arsdale,

(Seal) Y Acting Commissioner of Patents.

